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I know a guy cut up a huge piece with a sawzall.

Yep. The bullet weight is affected by the alloy ingredients.

BTW, you are correct that xray-related lead is pure dead-soft lead. It will never shoot well in a .40S&W because the pressure is too high. Pure lead is good for making fishing weights and muzzle-loading black powder rifles, but not for high pressure pistol bullets.

If you do a 50-50 mix of pure lead and linotype, then you'd have the classic "hardball" alloy (2% tin, 6% antimony, 92% lead).

That lead you have now is still good for mixing with other ingredients, but you'll need to add some antimony and tin to get something useful.

Here are a couple of good links:

http://www.lasc.us/CastBulletAlloy.htm" onclick="window.open(this.href);return false;
http://www.lasc.us/castbulletnotes.htm" onclick="window.open(this.href);return false;